Active Frequency Selective Surface Based L-band Noise Rejection Conformal Radome

Active frequency selective surfaces have long been employed in the field of mutual coupling suppression and are receiving increasingly more attention due to its remarkable performances and flexibility. However, the frequency tunable range of the resonators is usually not wide enough, especially for the band-stop ones. Meanwhile, a tunable frequency selective surface usually requires a bias network, which makes the design even more difficult and limits the use of active frequency selective surfaces in building radomes. In this work, we make use of a previously designed broadband active frequency selective surface to realize a conformal tunable radome, the measured resonant frequency of which is tuned from 935MHz up to 2.405 GHz, and the designed structure is capable of suppressing narrow band noise effectively through the whole L-band.